Nuclear power plants are licensed to operate at a fixed rating of reactor core thermal power. Capacity losses that occur may be attributable to one or more sources such as feedwater flow nozzle fouling, cycle isolation problems, malfunctioning equipment, etc. Depending upon the severity and extent of the problems, the losses could be substantial. Using a case study for an 800-Mwe nuclear power plant, the paper examines some of the sources of capacity losses that could occur and quantification of the losses. The use of a performance modeling tool in analyzing the losses is presented. Since various plant parameters are impacted when these losses occur, their importance in monitoring performance and serving as diagnostic tools is discussed.

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